A049816 - OEIS

A049816 as a triangular array

0

0 0

0 1 0

0 0 1 0

0 1 2 1 0

0 0 0 1 1 0

0 1 1 2 2 1 0

0 0 2 0 3 1 1 0

0 1 0 1 2 1 2 1 0

0 0 1 1 0 2 2 1 1 0

0 1 2 2 1 2 3 3 2 1 0

0 0 0 0 2 0 3 1 1 1 1 0

0 1 1 1 3 1 2 4 2 2 2 1 0

0 0 0 0 0 0 0 0 0 0 0 0 0

0 1 0 1 0 1 0 1 0 1 0 1

0 1 2 0 1 2 0 1 2 0 1

0 1 1 2 0 1 1 2 0 1

0 1 2 3 2 0 1 2 3

0 1 1 1 2 2 0 1

0 1 2 2 3 3 2

0 1 1 3 1 4

0 1 2 1 2

0 1 1 2

0 1 2

0 1

0